If a new human metabolic disease is found that only allows electrons to be used from NADH and not
FADH2, what is a probable explanation for the cause of the disease?
a. a defect in assembly protein genes for complex II of the electron transfer system
b. enzyme defects in glycolysis and the citric acid cycle
c. a deficient amount of cytochrome c and coenzyme Q
d. improper regulation of phosphofructokinase
e. inability of oxygen to act as a final electron acceptor
A
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A worker in a cheese-making facility argued that whey, a nutrient-rich by-product of the process, should be dumped into a nearby pond to serve as fish food.Is this a good idea or a bad one, and why?
A. It's a great idea! Let's feed the fish and help them multiply! B. Bad idea-the fish won't be able to eat the whey, so it will sit there rotting and pollute the waters, making them uninhabitable for the fish. C. Bad idea-bacteria would thrive on this rich nutrient source and multiply readily. As they multiply, they'll use the oxygen in the water to harvest the energy from the whey, depleting it. As the oxygen depletes below a certain point, the fish (and perhaps other organisms) will not be able to survive. D. Great idea! This will not only feed the fish, but also microbes and other small organisms. It'll enhance the entire food chain and help all of them!
Silica-rich shells of ancient diatoms are the source of diatomaceous earth that can be used _____
a. to thicken foods c. as a fertilizer b. as a gelatin substitute d. as an insecticide
Earthworms and birds have a crop that is modified
for a. digestion of cellulose. b. food storage. c. mechanical breakdown of food. d. digestion of fats. e. storage and elimination of undigested food.
Sea stars and sea urchins operate their tube feet by
A. cilia transporting hemolymph from chamber to chamber. B. a water vascular system that regulates water pressure. C. sticky threads leading from the mouth and primitive brain. D. actin and myosin fibers that slide and give muscle actions to the five arms or "rays."